Loop-lock-stitch sewing-machine.



-PATENTED FEB. 12,-1907.

P. MERRIGK. LOOP LOCK STITOH SEWING MACHINE.

APPLICATION FILED OOT.1Z,1905.

2 SHEETS-SHEET 1.

1710622602:- 3M wi y QQQM Fr. QMAQOJLL Zflizesses' r' 1 Ni c orzey.

PATENTED FEB. 12, 1907.

F.'W. MERRIGK; LOOP LOCK STITCH SEWING MACHINE.

APPLIGATION' FILED OUT. 12. 1905.

2 SHEETS-SHEET 2.

Weizfornegn called loop-lock stitch.

i'ui-ed frainc of the machine.

mint STATES PATENT anion.

Application filed. October 12,

Specification of Letters Patent,

SEW!NGillllAQl-lIN;E..

Patented Feb. 12, 1907.

1905. Sfll'ialllfl. 282,432.

T0 at LU/b07111 it may concern.- I

Be it known that l, FRANK lV. hlERI-IIOK, a citizen of the United States, residing at Bosl ton, in the county of Suffolk, State of Massai chusetts, have invented a certain new and useful improvement in Loop-Loclz-Stitch l Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings. l The invention consists in a machine of I simple construction iitted for working at high speed, operating to produce the so- Such stitch is i made by the use of two threads, one thread i having a loop thereof extended into the sub l stance of the material or stock in which the stitch is formed from one surface of the said naterial or stock and the other thread havl ing a doubled portion thereof extended from i the opposite surface of the material or stock E into the said substance, passing through and i caught by the loop aforesaid of the first thread and bent back upon itself around the bight of the said loop. A scam formed by the 1 said stitch resembles in external appearance l a lock-stitch seain made with the aid of a shuttle and is free from the ridge that is coni stituted by the interchaining portions of the stitches of a chain-stitch scain.

An embodiment of the invention is illusi trated in the accompanying drawings, in which latter- Figure 1 is an end elevation of a portion of a. machine containing the said embodiment, 1 only such parts being shown as are required for the purposes of a clear presentation of the invention itself. Fig. 2 shows in side or front elevation the parts which are shown in Fig. 1. I Fig. larger than Figs. 1 and 2, showing the \YOllG I support, a thickness of .iuaterial or steel; resting thereon, the prosser resting upon the said material or stock, the needle, the needlebar, and the looper. Figs. 4:, o, and (3 .views similar to Fig. 3, showing different i i l stages .in the operations by which a stitch is formed. Having reference to the drawings, at 1 is 3 shown a portion of the head forming part of the overhanging arm or gooscnecl of the i 2 is a portion of l the lower part of the said frame, 3 is the i fixed post, which is located upon one end of the said lower part 2 of the frame, and 4t is the work-support upon the top of the said 3 is a detail view, on a scale somewhat post. A piece of material or stock 5, which for brevity may be termed the work, is shown lying upon the top of the work-support a. the top of the said piece of material or stock, and at 61 is shown the lower portion of the presser-bar, which latter, as usual, is fitted to guides with which the head 1 is provided.

At 7 is a hooked needle working upwardly from below; at 71, the needle-bar; at 72, the feed-post, having guides in which the needie-bar is fitted and moveslengthwise; at .7 3, a motiontransn1itting link having'one end At 6 is shown a presser bearing uponthereof p'ivotally joined to the needle-bar; at S 7a, a crank-pin towhieh the other end of the said link is connected; at 7 5, a disk carrying the said oranlepin, and at 76 a rotating shaft that. is mounted in hearings in the lower part 2 of the frame and on which the crank-disk is made fast. When the shaft 76 is rotated, motion is communicated to the needlebar in the usual manner through the connections which have just been described.

8 8 are parallel rockers on which the feedpost 7 2 is mounted, substantially as in United States Letters Patent for feed mechanism for sewing-machines granted to me April 11, 1905,1No. 786,909. The feed movements are produced by causing the said rockers to vibrate back and forth in the line of the feed by means not necessary to be shown or explained herein.

At 9 is shown a portion of the thread-guide, the latter being operated to lay the thread in the open eye of the needle when the latter occupies its elevated position; at 10, a por- E tion of the thread-finger or thread-measurer;

at 11, Fig. 1, a portion of the take-up arm or lever, and at 12 an awl, the awl-bar (not shown) being fitted to guides with which the head 1 is furnished.

As thus iar described the parts are old.

in operation the a l descends, maldng ahole through the material or stock, and then rises, followed by the needle, which latter passes up through the hole made by the owl. The thread' g'rtide lays the thread a in the open eye of the needle, which descends, drawing aloop of thread through the awh hole in the. material or stock.

At 14: is a looper working beneath the material or stock and operating to place a doubled portion of a second thread 1) within the loop drawn down by the needle. The

said looper is applied to a looper-carrier 1 5,

V the latter. being" supported upon the feedpivotal stud or screw 151.

post at the-inner side thereof means of a The upper end of the looper--carrier is formed with a split clamp which receives the stem'ot the looper and is tightened upon the said stem by means of escrow 1521. to hold the looper se curely. The stem of the looper is bent laterally, as shown in Fig. 2, so as to cause the working end of the looper to extend into the same vertical plane with the needle in the direction of the feed. The said working end is bent or curved and also pointed to form a beak and has an eye 142 through the said beak near the point, and a second eye 141 is made through the upperportion of the loo perstem adjacent the beak. The second or under thread b, coming from a s1itable-so:.1'ce of supply, (not shown,) is passed throigh the is fed. For the act; ation of the looper the loopercarrier is operatively combined with the needle-bar by means of a roll or other projection with which the needle-bar is farnished and which acts in the movements of the needle-bar to occasion the req-.. ired w0rking of the looper. The said roll is shown at 16. It makes contact with the body ot the looper-carrier. The said body is h rnished with a straight surface at 152, along which the roll travels thro'ggh the greater part of the movement of the needle-bar and needle -up and down without any movement of the looper taking place, with a cam portion. 153,

which the roll 16 impinges against as the needle-bar and needle approach the end of their stroke in drawing a loop of 12 per thread through the work and with a u ell portion 154 below the said cam portion. The pressure of the roll against the inclined can1- surface during the descent of the needle-bar and. needle operates to tLIIl the looper-earrier and move the looper to 051.186 the working end of the latter to pass in above the point 'of the needle between the said point and the under surface of the work, as indicatcd in Fig.4. looper is caused to enter the said loop of 1pper thread, as represented in the said iigi re. The extent of the movement whichis given to the looper by the action of roll 16 against the s'rface of the cam portion 153 of the looper-carrier is such as to ca:.sc the'looper to press against one side of the loop of upper thread held by the descending needle and I strainsuch side toward the opening of the eye ofthe needle, as indicated in Fig. 5. The roll Thereby the beak of the- 16 moves along the straight dwell portion 154 during the final portion of the descent of the needle-bar and needle without further move? ment being communicated to the looper, the contact of the roll with the said dwell portion operating to keep the looper stationary in the position shown in Fig. 5' dtring such portion of the said descent and also during the first portion of the ascent of the needlebar and needle. As the ncedle-bar and. needle begin to rise the strain of the hook of the needle upon the loop of upper thread is relaxed, permitting the said loop-to pass out from the eye of the needle under the pressure of the looper against one side thereof, such pressure existing in the position of the looper shown in Fig. 5, as already explained. The loop of upper thread this ireed from the use dle is drawn by'the action of-the take-up up against the beak of the looper. As this oc-- curs the continued rise of the needle-bar car rice the roll 16 upward along the cam portion 153 of the looperscarrier.

The looper-carrier is engaged by a spring 17, Fig. 2, having the coil thereof loosely supported upon the hub portion of theloopercarrier, with one bent end. of the said spring in engagement with the looper-carrier and the other with the feed-post. acts' with atendency to move the looper-carrier and looper in the direction opposite to that in which they are moved by the pres:

The said spring sure of roll 16 against cam portion. 1.53, and

it holds the looper-carrier pressed into contact with the roll. As, therefore,- the roll 16 rec travels upward along the'surface of the cam portion 153 the looner-carrier and looper are moved reversely through the action of the spring, so as to withdraw the beak of the looper from the ascending loop of upper. thread' in this withdrawing movement of. the looper the portion of under thread which by the advancing movement of the looper was extended from the last-completed stitch to the eye 142 (see Fig. 5) is doubled or buckled upon itself and let t 'proj eeting beyond the extreme tip of the. looper, as will appear in Fig. 6. As the said tip escapes from the tightenin loop of upper thread. the said loop clasps the doubled and projecting portion'of the under thread, retaining the same and drawing thesame'up into the awl-hole as the final tightening of the stitch takes place. Thereby the stitch is completed. During the upward travel of the roll 16 along the surface 152 of the looper-canier, occurringas the needle-bar and needle rise to cause the needle to pass through a newly-formed aWlhole in the work preparatory to receiving the upper thread for the production of the'next i In Its

stitch, the looper dwells in its retracted position occupied in Fig. 3'.

feed-post and accompanying the same and. the needle-bar and needle-in the feed and re- In consequence of being mounted upon the tion thereof, and thereby turn movements the looper always retains dle.

In the illustrated embodiment of the invention the use of a detent lor holding the doubled portion ol under thread during the withdrawing movement of the looper is dispensed with.

On its way to the working end of the looper the under .thread I) passes through a tension device 18. The latter is mounted upon or in connection with the looper-carrier in order that the movements of the looper may not act to take up the under thread I), so as to withdraw the doubled or buckled porprevent such portion from being caught properly by the tightening loop of upper thread.

1 claim as 1nyinvention- 1. In a loop-lockstitch sewing-machine, the combination with the needle, needle-bar, and feed -post, supporting the needle bar, of a looper constructed to introduce loops of the loop-lock thread within loops of another thread passed by the needle through the material being stitched, said looper mounted upon the teed-postand accompanying the latter in its movements and means for operating the said looper.

2. in a loop-loclt-stitch sewing-inachine, the combination with the needle, needle-bar, and teed-post, supporting the needle-bar of a looper for the loop lock thread.operated by the said needlc-bar and supported by the said feed-post said looper coi'istriicted to iiitroduce loops of the looplock thread within loops of another thread drawn by the needle through the material being stitched.

3. in a loop-lock-siitch sewing-machine, the combination with the needle, necdle-ba r, and teed-post, supporting the needle-bar of a looper [or the loop-lock thread constructed to introduce loops ofthe loop-lock thread within loops of another thread drawn by the needle through the material being stitched, a looper-carricr PlVOiitll) connected with the said l'ecd-post, and a roll or projection arricd by the needle-bar and engaging with the said lotipcr-carricr to operate the said looper.

4. in a looplocl -stitch sewing-niachine, the combination with the reciprocating hooked needle, ol" the reciprocating looper construct ed and operating to insert a doubled portion. of locltin thread into the loop of thread drawn by to cast oil the said loop from the needle and means loraciuaiing the said looper.

o. in a lot p-loclt-stitch machine, in com.- liinaiion, a reciprocating needle by which a loop of thread is passed through the material the needle, and also acting i l l l l i l l l i, i i

l l i l l E tcrial and having a delivery and a take-up operating I being operated upon, a looper working in its working relations with respect to the neeclose proximity to one surface of the said inaend which enters the said loop and around which the latter tightens in being drawn, the said looper having a guide-eye for the loop-lock thread delivering the said thread at the surface of the looper next the adjacent surface of the said material, and the looper operating by its return movement to buckle the loop-lock thread upon itself within the embracing loop of needle-thread, and operating means for the needle and looper.

6. In a loop-loclstitch machine, in combination, a reciprocating needle by which a loop of thread is passed through the material being operated upon, a looper Working in close proximity to one surface of the said material and having a delivery end which enters the said loop and around which the latter tightens in being drawn, the said looper having a guide-eye for the loop-lock thread delivering the said thread at the surface of the looper next the adjacent surface of the said inateriahand the looper ope-ratingby its return movement to buckle the loop-lock thread upon itself within the loop of needle-thread, actuating means for the needle and looper,

to draw the needleloop to clasp the buckled loop-lock thread at the tip of the looper as the latter withdraws.

7. in a loop-loch-stitch machine, in combination, a reciprocating needle by which a loop of thread is passed through the material being operated upon, a looper having a delivery end which enters the said loop and around which the latter tightens, the said looper having a guide-eye for the loop-lock thread delivering the said. thread at the adjacent surl'ace ol' the said material, and being grooved to con'line the thread. at such surface, the loope operating by its return in0Vement to buckle the loop-lock thread upon itself within the loop of needle-thread, and opdle, and looper constructed and operating to ii'itroducc a doubled or buckled portion-0i thread into the needle-loop, of a tension device lor the loop-lock thread mounted upon or in connection with the said looper. and actuating means for the looper.

ln tcstini my whereol l allix my signature in presence of two witnesses.

l RAN K N. Mllltlt ICK.

Witnesses:

(loss. i .ltaunaui, .lliillll J. ANDERSON. 

